Population Structure and Growth Pattern of the Clam Gefrarium tumidium in Mangrove Ecosystems
DOI:
https://doi.org/10.35800/jip.v14i2.68498Keywords:
Gefrarium tumidum, cluster analysis, length–weight relationship, population structure, Darunu Mangrove Park, aquatic resource managementAbstract
This study aimed to analyze the population structure and growth pattern of G. tumidum through morphometric cluster analysis, size frequency distribution, and length–weight relationship approaches as a basis for aquatic resource management. Sampling was conducted in the mangrove ecosystem using purposive sampling methods. The measured parameters included shell length, width, height, and total weight of individuals. Cluster analysis was performed using Ward’s method with Euclidean distance on standardized morphometric data, while the length–weight relationship was analyzed using a regression model. The results showed that the size of G. tumidum ranged from 18.7–38.3 mm with an average shell length of 29.6 mm and an average weight of 8.7 g. The size frequency distribution was dominated by medium-sized individuals. Cluster analysis revealed size groupings indicating a heterogeneous population structure. The length–weight relationship showed a strong correlation with a negative allometric growth pattern, where shell length increased faster than body weight. The observed size variation and growth patterns suggest differences in population structure influenced by mangrove habitat conditions. These findings provide baseline information on the population characteristics of G. tumidum that can support sustainable management of clam resources.
Keywords: Gefrarium tumidum, cluster analysis, length–weight relationship, population structure, mangrove, aquatic resource management.
Abstrak. Penelitian ini bertujuan untuk menganalisis struktur populasi dan pola pertumbuhan G. tumidum melalui pendekatan analisis klaster morfometrik, distribusi frekuensi ukuran, dan hubungan panjang–berat sebagai dasar pengelolaan sumber daya perairan. Pengambilan sampel dilakukan pada ekosistem mangrove menggunakan metode purposive sampling. Parameter yang diukur meliputi panjang, lebar, tinggi cangkang, dan berat total individu. Analisis klaster dilakukan menggunakan metode Ward dengan jarak Euclidean terhadap data morfometrik yang telah distandardisasi, sedangkan hubungan panjang–berat dianalisis menggunakan model regresi. Hasil penelitian menunjukkan bahwa ukuran G. tumidum berkisar antara 18,7–38,3 mm dengan rata-rata panjang 29,6 mm dan berat rata-rata 8,7 g. Distribusi frekuensi ukuran didominasi oleh individu berukuran sedang. Analisis klaster menunjukkan adanya pengelompokan ukuran yang mencerminkan struktur populasi yang heterogen. Hubungan panjang–berat menunjukkan korelasi yang kuat dengan pola pertumbuhan allometrik negatif, dimana pertambahan panjang cangkang lebih cepat dibandingkan dengan pertambahan berat tubuh. Variasi ukuran dan pola pertumbuhan yang ditemukan menunjukkan adanya perbedaan struktur populasi yang dipengaruhi oleh kondisi lingkungan habitat mangrove. Hasil penelitian ini memberikan informasi dasar mengenai karakteristik populasi G. tumidum yang dapat digunakan sebagai dasar pengelolaan sumber daya kerang secara berkelanjutan.
Kata kunci: Gefrarium tumidum, analisis klaster, hubungan panjang–berat, struktur populasi, mangrove, pengelolaan sumber daya perairan.
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